Update cheatsheets

osx/df

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+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# df
+
+> Display an overview of the filesystem disk space usage.
+> More information: <https://keith.github.io/xcode-man-pages/df.1.html>.
+
+- Display all filesystems and their disk usage using 512-byte units:
+
+`df`
+
+- Use [h]uman-readable units (based on powers of 1024) and display a grand total:
+
+`df -h -c`
+
+- Use [H]uman-readable units (based on powers of 1000):
+
+`df -{{-si|H}}`
+
+- Display the filesystem and its disk usage containing the given file or directory:
+
+`df {{path/to/file_or_directory}}`
+
+- Include statistics on the number of free and used [i]nodes including the filesystem t[Y]pes:
+
+`df -iY`
+
+- Use 1024-byte units when writing space figures:
+
+`df -k`
+
+- Display information in a [P]ortable way:
+
+`df -P`